Construction of manholes fo conduits.



No. 734,153. PATENTED JULY 21, 1903.

H. 0. BAKER, JR.

CONSTRUCTION OF MANHOLES FOR GONDUITS.

v APPLICATION FILED APR.1, 1903. H0 MODEL 3 SHEETS-SHEET l.

ATTORNEYS No. 734,153. PATENTED JULY 21-, 1903. H. C. BAKERq-JB- CONSTRUCTION OF MANHOLES FOR GONDUITS.

APPLICATION FILED APR. 1, 1903.

NQMODEL. 3 SHEETS-SHEET 2.

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No. 734,153. 4 PATENTED JULY 21, 1903.

H. c. BAKER, JR.

SJ'ION OF MANHOLES FOR GONDUITS.

APPLIOATION FILED APR. 1, 19.03.

no MODEL. 3 SHEETS-SHEET s.

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UNITED STATES.

HUGH o. BAKER, JR,

Patented July 21, 1903.

PATMQEEIQEJ OF NEW IORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 734,153, dated July 21, 1903.

I Application filed April 1, 1903. Serial No. 150,532. (No model.) f

To all whom it may concern:

Be it known that I,-HUGH C. BAKER, Jr., a subjectof the King of Great Britain, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in the Construction of Manholes for Electrical and other Conduits, of which the following is a specification such as will enable those skilled in the art to which it appertains to make and use the same.

Theobject of this invention is to provide a manhole for electrical and other conduits of improved construction whereby the said construction is simplified and the cost thereof materially reduced; and theinvention consists of the form of the manhole, and of the details of the construction thereof, and of the material of which the manhole is composed and the shape or form thereof.

The invention is fully disclosed in the following specification, of which the accompanying drawingsform a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which- Figure 1 is a plan view of a manhole for an electrical conduit made according to my invention; Fig. 2, a section thereon on the line i 2 2 of Fig. 1; Fig. 3, a section on the line3 3 of Fig. 2 or on the line 3 3 of Fig. 4; Fig. 4, a section on the line 44 of Fig. 1; Figs 5 and 6, a plan and inside view, respectively, of one form of a brick or block employed in the construction of the manhole; Figs. 7 and 8, views similar to Figs. 5 and 6 of another form of a brick or block employed in the construction of the manhole; Figs. 9 and 10, a plan and transversesection, respectively, of bricks or blocks, from which the cover of the manhole is formed, part of the construction in Fig. 9 being broken away; and Figs. 11 and 12 are views similar to Figs. 9 and 10, showing another form of a brick or block employed in the construction of the cover of the manhole. In the practice of my invention I provide a manhole a, composed of a concrete or other suitable bottom I), a cover 0, an inclosing wall or Walls (1, through which electrical conduits e are passed in the usual or any desired manner, and in'the top of which is the usual manhole-opening f, having a cover 9.

The inclosing wall (1 of the manhole is composed of separate horizontallayers of bricks or blocks (1 and these separate layers of bricks or blocks are composed of two diiferent forms of bricksor blocks (1 and d, which are shown in detail in Figs. 5 and 6 and in Figs. 7 and 8, respectively.

It will be observed that the form of the manhole in horizontal section is substantially elliptical, the ends thereof being truncated or I cutoff in such-a manner as to form a slight end curve in horizontal section the corners of which are abruptly curved, as indicated at d and d in Fig. 3.

The separate bricks or blocks d and 4. from which the inclosing wall 01 or the body wall of the manhole is made, are preferably composed of concrete, but may be composed of any desired material capable of being wall at of the manhole.

depth of the separate bricks or blocks d and d'and on the number of layers of such bricks or blocks employed, and in practice these bricks or blocks are placed together in the manner of ordinary bricks or blocks, so that the joints in one layer are broken or overlapped by the layer thereover, and in order to use the end bricks or blocks (Z 111 the successive layers they must simply be reversed in each successive layer.

The cover 0 of the manhole is composed of two dilferent styles of bricks or blocks a and 0 (shown, respectively, in. Figs. 9 and 10 and Figs. .11 and 12,) and these bricks or blocks are composed of concrete or other suitable material having a reinforcement c of expanded metal. The cover also involves in addition to the bricks or blocks 0 and c transverse I-beams or rails 71., as shown in Figs. 1 and 2, and in practice these beams are placed in position transversely of the top of the manhole, and the bricks or blocks 0 are slid into position at the opposite sides of the manhole-opening f, and two of these bricks or blocks are employed, while four of the bricks or blocks 0 are employed, as shown in Fig. 1, and the bricks or blocks a are beveled at their opposite sides, as shown at 0 so as to fit between the top and bottom flanges of the rails it, while the bricks or blocks 0 are beveled at one side, as shown at c, for a similar purpose.

When the parts h, 0 and e have been placed together, as above described, a central rectangular openingf is formed in the top 0 of the manhole, said opening being shown in dotted lines in Fig. 1, and over and around this is placed an annular row of bricks t', over which is placed an annular metal casingj, having a removable metal cap 70, which fits thereinto in the usual manner, and the top of the part 7' is in practice flush with the earth-line,

which is indicated at m in Fig. 2. As thus constructed it will be seen that the entire inclosing or body wall (1 of the manhole is made of bricks or blocks of two different forms, while the cover 0 thereof consists also of bricks or blocks of two different forms together with the transverse bars h in connecliOn with which said bricks or blocks are employed, and the interior of the manhole is of such shape in horizontal section as to facilitate the passage of electric wires thereinto and therethrough and the connection of such wires therein.

It will be seen on reference to Figs. 9 and 10 that the bricks or blocks 0 as shown, have two parallel sides, to which the inner end thereof is at right angles, while the outer end thereof is segmentalin form; butit will be apparent that the inner end of these bricks or blocks may be concave and segmental in form, in which case the openingfwould be circular in form, or substantially so, instead of rectangular, as shown. It will also be seen that the blocks 0 have two sides at right angles to each other, while the other side is formed on a curve similar to that of the curve of the corner portions of the manhole in horizontal section, and by reason of this fact the bricks or blocks 0 may be so placed as to form a cover for the opposite end portions of the manhole.

The manhole a is also provided with the usual bottom drain n, and while my invention is particularly adapted for use in the construction of manholes for electrical conduits the principle thereof may also be employed in the construction of manholes and catch-basins, sewers, drains, water-mains, and other pipes or conduits of various kinds or classes.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A cover for a manhole comprising parallel bars and bricks or blocks of two difierent shapes, substantially as shown and described.

- 2. A manhole for electrical and other conduits the inclosing or body wall of which is com posed of separate layers of bricks or blocks of two different styles, said bricks or blocks being curved in such a manner that they form a manhole substantially elliptical in horizontal section, said manhole being also provided with a cover comprising parallel bars and bricks or blocks of two ditferent shapes, substantially as shown and described.

3. A manhole for electrical and other condnits the inclosing or body wall of which is composed of separate layers of bricks or blocks of two different styles, said bricks or blocks being curved in such a manner that they form a manhole substantially elliptical in horizontal section, said manhole being also provided with a cover comprising parallel bars and bricks or blocks of two diiferent shapes, and in which is a central opening provided with a removable cover, substantially as shown and described.

4. A manhole for electrical conduits the inclosing or body wall of which is substantially elliptical in horizontal section and composed of separate layers of bricks or blocks of two different shapes, the cover of the manhole being composed of transverse bars and bricks or blocks of two different shapes and provided with a central opening, substantially as shown and described.

5. A cover for manholes, composed of parallel bars and bricks or blocks of different shapes, two of said bricks or blocks being of the same shape and being placed between said bars, and four of said bricks or blocks being of the same shape and forming the end or side portions of the cover, substantially as shown and described.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of the subscribing witnesses, this 30th day of March, 1903.

HUGH O. BAKER, JR.

Witnesses:

J. O. LARSEN, F. A. STEWART. 

